Basically copy coupon, view price history or create e-mail price alert. Do you want to know what the best price is?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
2x Main Brushes, 1x Cleaning Tool, 4x Side Brushes, 4x HEPA Filters, 1x Yellow Cleaning Tool
Banggood
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): 9OFFSUMMER, BGAHPU13, Cuponation9, BG8ReviTrage, BG00c906, BGeaf456, BGBF11245, BG589b2e, BG619d12
(there’s a little possibility that old coupon will work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – 12pcs Replacements Roborock Vacuum Cleaner [EU] ($-3)
Price history and price alert
Here is price history (for all/most countries) for 12pcs Replacements Roborock Vacuum Cleaner.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).